Apparatus for and method of agitating pulp stock



J. A. ROSMAIT Feb. 8, 1938.

APPARATUS FOR AND METHOD OF AGITATING PULP STOCK Filed Dec. 13, 1935 2 Sheets-Sheet l mvmox. John A. fioamait I ATTORNEYS.

Feb. 8, 1938. J. A. ROSMAIT 2,107,390

APPARATUS FOR AND METHOD OF AGITATING PULP STOCK F iled Dec. 15, 1935 2 Sheets-Sheet 2 INVENTOR myyar ATTORNEYS.

and process that the Patented Feb. 8, 1938 PATENT OFFICE.

I APPARATUS FOR ANDltIETHOD OF AGI'I'AT- lNG PULP STOCK John A. Rosmait,

Manistee, Mich.

Application December 18,- 1935, Serial No. 54,157

9 Claims.

This invention relates toan improved method of and apparatus for agitating pulp stock during the manufacture of paper.

In paper manufacture pulp stock is stored in large storage chests. In large part it is made up of water. The pulp fibers are carried in the water and unless it is thoroughly agitated the pulp fibers will either sinkto the bottom or float on the top, depending upon the character of the pulp stock employed and the entire mixture will exhibit considerable diversity as to character. It is desirable to keep the mixture so agitated that it will present a uniform character in order that when it is withdrawn for fabrication into the paper it will present a uniform character. vVarious types of apparatus have heretofore been provided to perform this function by agitation.

The apparatus and process here disclosed is intended to maintain the pulp stock at a uniform character by re-circulation of stock from one portion of the storage chest to the other and. through the chest and notwithstanding the de--- livery of additional pulp stock into the chest, and P to do so in a manner which is economical in the use of power, which will not break up or injure the character of the fibers, which will maintain a uniform character of pulpstock regardless of the height of the stock in the chest and regardto the chest and which makes use of a minimum number of operating parts and which will thoroughly agitate the stock throughout the entire interior of the chest so as to eliminate the formation of dead spots or islands of stock within the chest.

Another object is to provide such an apparatusbf new stock which is being constantly addedto the re-circulated stock in the chest is thoroughly mixed and mingled therewith and is so added that it is mixed with the incoming stream of re-circulated pulp stock prior to such stream being discharged into the total quantity of stock in the chest.

A meritorious feature is the provision of a recirculatory system which includes the chest itself and wherein the pulp stock is caused to flow through the chest insuch a manner that the formation of dead spots adjacent the side walls of the chest at the bottom thereof is eliminated and the arrangement is such that the side walls of the chest may be flushed off if desired.

Other objects, advantages and meritorious features of my invention willmore fully appear from the following specification, appended claims, and accompanying drawings, wherein:

Figure 1 is a vertical sectional view through a storage chest exhibiting my invention,

Fig. 2 is a section through a fragment of the chest showing a modified form of construction,

Fig. 3 is a vertical sectional view through a storage chest of the same general character as is illustrated in Fig. 1, but wherein the construction is slightly different, and Fig. 4 is a perspective of the upper end of the pump outletleading tp the chest as shown in Fig. 3. I

The storage chest is indicated generally as Hi. This may be formed of concrete or other'suitable material and may be of a cylindricalform and is shown in the illustration as being an upright chest. In the manufacture of paper the pulp stock is delivered from the containers [2 and I3, which house heaters not illustrated, to the interior of the chest ill. Suitable valve structures, not shown, are provided to control such delivery. The chest shown in Fig. 1 is provided with a floor H which slopes uniformly to a central outlet that communicates with the intake I 6 of a pump 20. The pump is of a character suitable for this type of material at a low head and may be a centrifugal pump driven by the motor 22.

, 5' The pump is provided with an outlet 24 which less of the quantity of pulp stock being delivered :1 t

erminates at its discharge end in a flaring portion 26 of constantly increasing diameter as it *approaches such discharge end. Beater contjainer I2 is shown as communicating through a Q'onduit 28 with this flaring portion of the outlet. In the operation of the apparatus it is preferable that the beater deliver the new pulp stock into the chest through the pump outlet rather than directly thereinto and beaters may be so connected that all the new pulp stock'delivered to the chest is so delivered or, if desired, a certain portion thereof may be delivered directly into the chest through .the conduit 30 which is shown in Fig. 1

as leading from a beater container l3 directly into the chest.

The pump intake is provided with a control valve 32 and'a discharge conduit not shown may I lead from the pump for the forwarddelivery of of work and is adapted to deliver a large quantity 25 and sloping from a is of a similar character.

2 the pulp stock withinthe chest and its recirculation as herein described.

There is provided within the chest a domeshaped bailie 34 supported by standards 36 from the floor of the chest spaced above such floor high central portion toward the side wall of the chest so that the pulp stock flowing through the chest is causedby this baffle nicates through a conduit 29 with the flaring portion 2! of the pump outlet and wherein the conduit "enters the flaring portion at an angle so that the new pulp stock is delivered thereinto in opposition to the direction of flow of the stream of pulp stock being delivered'through the outlet from the pump. This insures a more thoroughly mixing of the new pulp stock with the recirculated pulp stock preliminary to its delivery into the chest. As the pulp stream from the pump enters the flaring portion of the outlet it is spread out in area and slowed up in rate of advance so that the delivery of the additional new pulp stock produces swirls and movements within the pulp stream which insures a more thorough mixing therein of the new with the recirculated stock.

Fig. 3 exhibits a slightly modified form of construction. The chest is indicated as lll,'the beater containers as I! and i3, and the outlets from the heaters as 2-8 and ill as in Fig. 1. The pump and its connections are numbered as they are in Fig. l and the baiile and its associated parts are similarly numbered .and the operation In this flgure however it .will be seen that the outlet 24 of the pump rises vertically through the chest and terminates in a flaring or funnel shaped discharge end portion which ,has a rolled over lip 21 over which the pulp stock empties into the chest and the beater container II delivers its new pulp stock directly downwardly into the rising stream of pulp stock from the pump so that there is a spreading outwardly and thorough diffusion of the new pulp stock with the recirculated stock prior to its flowing over the top of the discharge end of the outlet into the chest.

What I claim: 1. In apparatus forstoring and agitating pulp stock, a storage chest, a pump having an intake communicating with the lower end of the chest to withdraw pulp stock therefrom and having an outlet connected 5 chest to discharge pulp stock thereinto, said outlet provided with its discharge'end, having aflarlng portion adjacent to and a pulp-stock receptacle stock thereinto counter of flow of the stream of pulp stock'flowing therethrcugh fromthe pump. j

2. In apparatus for mu; audagitating pulp stock, a stor chest, a pump having'an intake pipccommunicating'withthelowcrendofthe chest to withdraw having an outlet .communi ting with the upper endofthechesttodlschargemitcckthereliver into it additional vwardly toward the side wall of over the margin of the baffle and underneath the baille to enter the pump intake, said pump having with the upperend of the .stock to mix with the an outlet leading intofsaid flaring por-' tion of the pump outlet to deliver additional pulp pulp stock therefrom and v into, and a pulp stock container provided with an outlet pipe extending into the outlet pipe leading from said pump and discharging thereinto in a direction counter to the direction of the flow of the pulp stock flowing therethrcugh from the pump.

3. In apparatus for storing and agitating pulp stock, a storage chest, a pump having an intake communicating with the lower end of. the chest to withdraw pulp stock therefrom and having an outlet communicating with the upper end of the chest to discharge pulp stock thereinto, said pump outlet provided with a portion adjacent to its discharge end of increasing diameter as it approaches said end, means for delivering additional pulp stock into said portion of increasing diameter counter the pulp stock stream flowing therethrcugh from the pump and a battle positioned within the chest in front of the pump intake and shaped to direct the pulp stock moving through the chest toward the pump intake outwardly toward the side wall of the chestbefore entering the pump intake.

4. In apparatus for storing and agitating pulp stock, an upright storage chest, a pump provided with an intake communicating through the floor of the chest with the interior thereof to withdraw pulp stock therefrom, said chest floor sloping toward the pump intake, a dome-shaped bailie supported within the floor thereof covering the pump intake and adapted to direct pulp stock moving through the chest outwardly toward the side wall of the chest to pass over the margin of the baiile .and underneath the baille to enter the pump intake, said pump having an outlet pipe communicating with the upper end of the chest to deliver a stream of pulp stock thereinto, a conduit so constructed and arranged with reference to the discharge end of said pump outlet pipe as pulp stock in opposition to the flow of pulp stock therethrcugh from the pump. v

5. In apparatus for storing and agitating pulp stock, an upright storage chest, a pump provided to dewith an intake communicating through the floor pulp stock therefrom, said'chest floor sloping toward thepump intake, a dome shaped baiile supported within the chest spaced above the floor thereof covering-the pump intake and adapted to direct pulp stock moving through the chest outan outlet pipe communicating with the upper end of the-chest to deliver a. stream of pulpstock thereinto, a conduit so constructed and with reference to the discharge end of said pump outlet pipe as to deliver into it additional pulp pulp stock flowing therethrough prior to delivery into the chest, said pump outlet pipe being flared adjacent to its discharge end.

6. In apparatus for stock, an upright-storage chest, a pump with an intake communicating through the floor of'the chest with the interior thereof to withdraw pulp stock therefrom, said chest floor sloping toward the pump intake, a dome-shaped haiile storing th agitating p p,

thechesttopw supportedwithinthechestspacedabovethefloor thereof covering the pump intake and adapted to directpulpsto'ckmoving throughthechestoutwardlytowardthesidewallofthechesttopus qverthemarginofthebailleandunderneafli qfl baiile to enter the pump intake, said pump having an outlet communicating with the upper end of the chest to deliver a stream of pulp stock thereinto, a conduit for delivering additional pulp stock into the pump outlet adjacent to its discharge end to mix with the pulp. stock flowing there through prior to delivery into the chest, said pump outlet having a portion adjacent to its discharge end ofv increasing diameter as it approaches said end, said conduit for delivering additional pulp stock emptying into said portion of increasing diameter at a point rearwardly of the end thereof.

'7. In apparatus for storing and agitating pulp stock, an upright storage chest, a pump provided with an intake communicating through the floor of the chest with the interior thereof to withdraw pulp stock therefrom, said chest floor sloping toward the pump intake, a dome-shaped baiiie supported within the chest spaced above the floor thereof covering the pump intake and adapted to direct pulp stock moving through the chest outwardly toward the side. wall of the chest to pass over the margin of the baiile and underneath the baiiie to enter the pump intake, said pump having an outlet extending upwardly through the chest and terminating in proximity to the upper end thereof in an upright flaring end portion, and means for delivering additional pulp stock directly downwardly into said flaring upright end portion of the pump outlet;

8. In apparatus for storing and agitating pulp stock, an upright storage chest, a pump provided with an intake communicating through the floor of the chest with the interior thereof to withdraw pulp stock therefrom, said chest floor sloping toward the pump intake, a dome-shaped ba'ile supported within the chest spaced above the floor thereof covering the pump intake and adapted to direct pulp stock moving through the chest outwardly toward the side wall of the chest to pass over the margin of the baiiie and underneath the bame to enter the pump intake, said pump having an outlet communicating with the upper end of the chest and terminating in a flaring end portion extending across the top of the chest and emptying thereinto at about the center of the top of the chest, and a conduit for delivering additional pulp stock into the flaring end portion of the pump outlet rearwardly of the discharge end thereof.

9. In apparatus for storing and agitating pulp stock, a storage chest for pulp stock having a bottom sloping downwardly to a point of maximum depth spaced equally distant from the side walls thereof, a pump having an intake communicating with the interior of said chest at substantially said point of maximum depth to with-.

draw pulp stock from the chest, a dome-shaped baflle supported within the chest spaced slightly above the bottom thereof and being of a diameter to cover a substantial part of the sloping bottom including said point of maximum depth and the pump intake, said baflie having a margin terminating in closer proximity to the outer edge of the bottom of the chest than to the central portion thereof, said outer margin ofsaid baiile being spaced slightly above the bottom of the chest with the central portion of the baflle spaced a substantially greater distance above said bottom, said baflle adapted to deflect the pulp stock moving downwardly through the chest outwardly toward and adjacent the side walls thereof before the stock is drawn beneath the baiiie. by the suction of the pump intake, said baflie provided with an aperture through its center adapted to admit a portion of the moving pulp stockto pass directly therethrough' into the area underneath the bailie without passing under the margin of the baifle.v JOHN A. ROSMAIT. 

